Mechanism for drawing textile roving



Filed Aug. l2, 1929 2 Sheets-Sheet l nvenr rmmda wsaZancas' UZZZZ;rneqys.

May 27, 1930.r F. cA'sABLANcAs 1,760,745

MECHANISM FOR DRAWING TEXTILE ROVNG Filed Aug. 12, 1929 {Sheets-sheet 2Patented y 27, i930 UTED FERNANDO-CASABLANCAS, F SABADELL, SPAINMECHANISIVI FR DRAWING TEXTILE ROVING Application led August 12, 1929,Serial No. 385407, and-in Spain October 19, 1928..

This invention relates to improvements in drawing mechanisms for textileroving, which consist in a special arrangement of the members employedfor exerting pressure on the top rollers.

In the usual drawing mechanisms, constitutedby three or more pairs ofrollers, as well as in mechanisms with a great draft in which therovineis guided, by means of a pair of endless 2belts or bands or byother means, from the intermediate pair of rollers to the drawingrollers, there is an increasing tendency to load by means of weightsall'the top rollers instead of loading only those ofthe front pairs ofthe mechanism.

The saddles or pressure parts hitherto used for weighting the toprollers, have drawbacks and present diiliculties in fitting, and l moreparticularly they have the drawback 2Q that it is not easy to withdrawthe rear roller or top feed roller without dismantling the pressuremechanism. `This rear roller is moreover the one which in practice it isadvisable to withdraw most frequently, particularly in mechanisms withgreat draft with belts or straps, for facilitating the introduction ofthe roving.

This invention relates to a saddle or-pres- Ysure member for exertingpressure on the pairs of rear rollers of the drawingmechanism or on allof them, which in addition to combining special conditions enabling itto be adaptedv to varying distances between the pairs of rollers, hasthe special advantage of facilitating the withdrawal of the upper feedroller and the replacing thereof in position withoit dismantling thepressure mechanism and without interrupting in any way the working ofthe drawing mechanism.

This saddle or pressure member hasa principal part which exerts pressureon the two rear rollers of the drawing'v mechanism, and is fitted bymeans of a concave bearing to the neck of the intermediate top rollerand by means of a straight branch or arm to the neck of the rear rollerso that it becomes possible to vary at will thedistance between the twopairs of rear rollers. VThis saddle has moreover a straight extension,directed rearwardly, which is situatedabove the bottom l rear roller andin close proximity thereto, in

member which acts on the front pair when a mechanism with three pairs ofrollers is under consideration, or on the two front palrswhen it is aquestion of a mechanism with four pairs. .The front pressure part isconnected to the rear part by means of a rod permanently secured to thefront part and passing loosely through a hole in the rear part. Thismakes it possible to vary at will the distance between the pairs of rearrollers and the front pair or pairs, the two parts-the front and rearone-of the saddle remaining neverthe less coupled together, avoiding anypossibility of uncoupling, so. that asingle tie rod which is pivotedpreferably to the rear of the front part of the saddle,is suflicient totransmit the action of the weight to all the top rollers of themechanism.

In the accompanying drawing are shown various examples of drawingmechanisms according to the invention. To simplify the drawings, onlythe parts of the drawing mechanism which are necessary to anunderstanding of the invention are shown.

Figure 1 shows in cross section a mechanism with great draft for aspinning frame with three pairs of rollers, the intermediate pair ofwhich has belts orstraps for guiding the roving and is provlded with apressure part which acts simultaneously on all the rollers.

Figure 2 shows a drawing mechanism wlth four pairs of rollers with apressure p art which acts simultaneously on the four pairs.

Figure 3 shows a modified construction in which the pressure part actsonly on the two rear rollers, the front roller being weightedindependently. U

The apparatus shown 1n Flgure'l, comprises a pair of feed rollers 1, 2,a pair of inpassed the two endless'belts 7, 8 guided by the frame 9 in amanner already known. The three pairs of rollers are supported in theusual manner by means of supports and bearings not shown in the drawing.

According to this invention, the mechanism comprises a saddle orpressure part which transmits pressure simultaneously to the three toprollers,.the said saddle being constituted by two essential parts whichare identiied jointly by the number 10 for the front part, and by thenumber 11 for the rear part. The part 10 is provided at its front endwith the concave bearing or part 12 adapted to bear on the neck of thetop roller 5, and at its rear end with a rod 13permanently secured to itand constituting the connection between the two parts 10, 11 of thepressure part. The rear part 11 is provided with a hole 1'4 throughwhich passes the rod 13, and forms at its front end a bearing 15intended -to engage with the neck of the intermediate roller 3, and atvthe rear end a straight flat branch 16 which engages with the neck yofthe roller 1. The hole 14 is slightly larger in diameter than the rod 13and is moreover reamered out towards one of its sides so that it allowsof a free movement of the part 11 relatively to the part 10. Owing tothis arrangement the apparatus can be fitted to the drawing mechanismwhatever may be the distance between the intermediate rollers 3, 4 andthe drawing rollers 5, 6 and in a similar manner, owing t0 the rear arm16 being straight the apparatus allows of any desired suitable distancebetween the feed rollers 1, 2 and the intermediate rollers 3, 4.

Moreover, the part 11 of this saddle has a` lower branch or arm 17 whichextends below the neck of the roller 1 and is situated above, and at avery small distance-from the neck of the roller 2. Owing to thisarrangement, when the roller 1 is withdrawn, the said branch 17 pressesagainst the bottom roller, the pressure part remaining approximately inthe same position shown in the drawing, without the pressure mechanismbecoming deranged or falling to pieces, and, what is still moreimportant, without the position of the pressure part, and therefore thedistribution of pressure of the other top rollers,

being materially altered, so that they con'-` tiiiue to workin normalmanner. Y

To facilitate the operation of withdrawing and replacing the top roller1, the branch 16 is raised in its rear part and forms an inclined plane18 in such a manner that in order to withdraw the roller, it is merelynecessary to raise it together with the pressure member to an extentsuiiicient to disengage its journals or necks from the grooves of thesupports, and then the very action 'of the inclined plane 18 of the armor branch forces the roller 1 towards the rear, that is to say, towardsthe right in thev drawing, the

pressure member remaining pressed by the bottom branch 17'against theroller 2. To replace the roller 1, it is suiiicient to engage the samewith the bearing and'to push it forwardly that is to say towards theleft in the drawing, owing to which, the neck of this 'zos roller 1acting on the inclined plane 18, will raise the pressure member to anextent suiil cient to enable the roller to travel on the bearing orsupport and to engage with its journals with the corresponding grooves,the apparatus then again occupying the position shown in the drawing.'

To transmit the action of the weight to the said saddle or pressuremember, to the part 10 is pivoted at its rear by means of a of theweight 31 has a tendency to turn the lever 22 about the point of supportof its end 24 and to raise its other end which 1s engaged in the ring 23so that it cannot be-ly come disengaged from the latter.

The front part 10 of the pressure mechanism has a branch or arm 25directed upwardly which is used to support the cleaning roller 26 and isextended and forms a handle 27 which enables the pressure mechanism tobe raised in order to withdraw the front roller 5 when necessary. At itsrear, this part 10 is provided with another extension 28 which isintended .to hold the cleaning roller 26-in the rear position 260 whennecessary.

In Figure 2 is shown the arrangement oi the pressure part applied to adrawing mechanism with four pairs of rollers. The mechanism comprisesthe two pairs of rear rollers 1, 2, 3, 4 on which presses the part 11exactly in the same way as has been explained with reference to Figure1, and this mechanism comprises moreover two front pairs of rollers 33,34, 5, 6, on which presses the front part 35 of the pressure mechanismwhich in this case is slightly modified and is provided at its lowerpart, with a lever 37 pivoted about a pin 36 which with one of its endspresses on the front roller 5 and with its other end presses on theintermediate roller 33. To the front part 35 is pivoted at the point 20,1n the same way as has been described with reference to Figure 1, thetie rod 21 which is threaded the rear part 11. p i

Figure 3 shows a modified construction in which the pair of frontrollers 5, 6 are weight ed by means of a weight independently of thatwhich acts on the rear rollers l, 2, 3, 4. To this end, the part 11' isarranged in the same way as alreadystated, with the exception that it isnot provided with a hole for fitting it to the rod 13. In place of thehole, to the said part ll is pivoted at a point 38, the rod 2l whichtransmits the action of the weight the pressure of which is distributedby the part l1 exclusively on the top roller 3 and on the top roller 1,whilst the top roller 5 is weighted in a manner already known by meansof a rod 39 arranged at the front part of the mechanism.

I claim 1. In a drawing mechanism for textile rovings, the arrangementof a pressure member which rests on the two rear pairs of rollers, meansfor transmitting to said pressure member the action of a Weight tocharge the said cylinders, said pressure member forming at its anteriorend a bearing by which it bears on the pair of intermediate rollers andat its rear two branches, the upper branch pressing on the top feedroller and the lower branch remaining over the neck of the bottom feedroller and at a short distance from it.

2. In a drawing mechanism for textile rovings, the arrangement of apressure member which presses on the two rear pairs of rollers; abearing at the front part of said member adapted to bear on theintermediate pair of rollers, an upper lbranch at the rear part of saidpressure member and in a backward direction, forming a straight partarallel to the direction of the libres, and in continuity of it aninclined part forming an angle with the former, said straight partservingto be applied on to the top feed roller while the mechanism isworking, and said inclined part to be applied against this same rollerat the moments when the roller is withdrawn or replaced in position, anda lower branch which remains at a very shortI distance from the neck ofthe bottom feed roller,

v with the object that when the top feed roller CII vWith is withdrawnthe pressure member remains resting by the lower branch on the neck ofthe bottom roller in an approximately normal position, withoutdisturbing the pressure mechanism and without interfering with thenormal working of the other rollers of the machine.

3. In a drawing mechanism for textile rovings, the combination of apressure member which bears on the two rear pairs of rollers a secondpressure member which charges the front rollers, said second pressuremember being provided with a rod with a rearward direction, which ispassed into a hole of the rear pressure member, so that both members arecoupled together and form one single pressure part which charges all theFERNANDO CASABLANCAS.

